Fig wasp

Fig wasp

Taxobox
name = Fig wasps

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image_caption = "Blastophaga psenes"
regnum = Animalia
phylum = Arthropoda
classis = Insecta
ordo = Hymenoptera
subordo = Apocrita
superfamilia = Chalcidoidea
familia = Agaonidae
subdivision_ranks = Subfamilies
subdivision =
*Agaoninae
*Epichrysomallinae
*Otitesellinae
*Sycoecinae
*Sycophaginae
*Sycoryctinae

Fig wasps are wasps of the family Agaonidae which pollinate figs or are otherwise associated with figs.

The family as presently defined is polyphyletic, including several unrelated lineages whose similarities are based upon their shared association with figs; efforts are underway to resolve the matter, and remove a number of constituent groups to other families, particularly the Pteromalidae and Torymidae. Thus, the number of genera in the family is in flux. Probably only the Agaoninae should be regarded as belonging to the Agaonidae, whilst the Sycoecinae, Otitesellinae and Sycoryctinae should be included in the Pteromalidae. Placement of the Sycophaginae and Epichrysomallinae remains uncertain.Among the Agaonidae, the female is a normal insect, while the males are mostly wingless. The males' only tasks are to mate with the females while still within the fig syconium and to chew a hole for the females to escape from the fig interior. This is the reverse of Strepsiptera and the bagworm, where the male is a normal insect and the female never leaves the host.

Most fig inflorescences contain three kinds of flowers: male, short female, and long female. Female fig wasps can reach the ovaries of short female flowers with their ovipositors, but not long female flowers. Thus the short flowers grow wasps, whereas the long flowers become seeds. In figs of this sort, the crunchy bits in the fruit contain both seeds and wasps. However, there are several commercial and ornamental varieties of fig that are self-fertile and do not require pollination; these varieties are not visited by fig wasps.

Pollinating fig wasps (Agaoninae) are specific to specific figs. The common fig "Ficus carica" is pollinated by "Blastophaga psenes".

Life Cycle

The life cycle of the fig wasp is closely intertwined with that of the fig tree they inhabit. The wasps that inhabit a particular tree can be loosely divided into two groups; pollinating and non-pollinating. The pollinating variety forms a mutually beneficial symbiosis with the tree, whereas the non-pollinating variety is parasitic. Both life cycles, however, are very similar.

Though the lives of individual species differ, a general fig wasp life cycle is as follows. In the beginning of the cycle, a mature female pollinator wasp enters a receptacle ("fruit") through a small natural opening, the ostiole, passes through the mouth of the fig, which is covered in male flowers, and deposits her eggs in the cavity, which is covered in female flowers, by oviposition. Forcing her way through the ostiole, she often loses her wings and most of her antennae. In depositing her eggs, the female also deposits pollen she picked up from her original host fig. This pollinates some of the female flowers on the inside surface of the fig and allows them to mature. After pollination, there are several species of non-pollinating wasps which deposit their eggs before the figs harden. These wasps act as parasites to either the fig or the pollinating wasps. As the fig develops, the wasp eggs hatch and develop into larvae. After going through the pupal stage, the mature male’s first act is to mate with a female. The males of many species lack wings and are unable to survive outside the fig for a sustained period of time. After mating, a male wasp begins to dig out of the fig, creating a tunnel for the females to escape through.

Once out of the fig, the male wasps quickly die. The females leave the figs, picking up pollen as they do. They then fly to another tree of the same species where they deposit their eggs and allow the cycle to begin again.

Genera

Genera currently included in Agaonidae according to the [http://internt.nhm.ac.uk/jdsml/perth/chalcidoids/listChalcids.dsml?Superfamily=Chalcidoidea&Family=Agaonidae Universal Chalcidoidea Database] :

References

*Rasplus, J.-Y., Kerdelhuse, C., Clainche, I. le & Mondor, G. 1998. "Molecular phylogeny of fig wasps. Agaonidae are not monophyletic." Comptes Rendus de l'Academie des Sciences (III) 321(6):517-527

External links

* [http://www.figweb.org/Interaction/Video/index.htm Video: Interaction of figs and fig wasps] Multi-award-winning documentary
* [http://www.figweb.org/index.htm Figs and fig wasps]
* [http://morphbank.net/Browse/ByImage/index.php?keywords=&tsnKeywords=agaonidae&spKeywords=&viewKeywords=whole+body&localityKeywords=&listField1=imageId&orderAsc1=DESC&listField2=&orderAsc2=ASC&listField3=&orderAsc3=ASC&numPerPage=20&goTo=&resetOffset=&activeSubmit=2 Images of fig wasps on Morphbank, a biological image database]


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См. также в других словарях:

  • fig wasp — fig′ wasp n. ent a chalcid wasp, Blastophaga psenes, that pollinates figs, usu. of the Smyrna variety • Etymology: 1880–85 …   From formal English to slang

  • fig wasp — n. any of a family (Agaonidae) of small wasps living in certain figs, esp. a wasp (Blastophaga psenes) active in the pollination of certain cultivated strains …   English World dictionary

  • fig wasp — a chalcid wasp, Blastophaga psenes, introduced into the U.S. from Europe, that pollinates figs, usually of the Smyrna variety. [1880 85] * * * ▪ insect also called  fig insect        any of about 900 species of tiny wasps responsible for… …   Universalium

  • fig wasp — noun : a minute insect (Blastophaga psenes) of the family Agaontidae that breeds in the caprifig and is important as the agent in the process of caprification; broadly : an insect of the family Agaontidae * * * a chalcid wasp, Blastophaga psenes …   Useful english dictionary

  • fig wasp — noun Date: 1883 a minute wasp (Blastophaga psenes of the family Agaontidae) that breeds in the caprifig and is the agent of caprification; broadly any wasp of the same family …   New Collegiate Dictionary

  • fig wasp — noun A wasp of the family Agaonidae, some of which pollinate figs …   Wiktionary

  • Wasp — Taxobox name = Wasp image width = 180px image caption = Aleiodes indiscretus parasitizing a gypsy moth caterpillar regnum = Animalia phylum = Arthropoda classis = Insecta ordo = Hymenoptera subdivision ranks = Suborder subdivision = Apocrita See… …   Wikipedia

  • fig — fig1 /fig/, n. 1. any tree or shrub belonging to the genus Ficus, of the mulberry family, esp. a small tree, F. carica, native to southwestern Asia, bearing a turbinate or pear shaped fruit that is eaten fresh, preserved, or dried. 2. the fruit… …   Universalium

  • wasp — (Roget s IV) n. Types of wasps include: common, fossorial, digging, digger, social, solitary, hunting, potter, paper, sand, wood, spider, mud, fig, gall, cuckoo, thread waisted; (mud) dauber, yellow jacket, hornet; see also bee 1 …   English dictionary for students

  • Common fig — Ficus carica Common Fig Common Fig foliage and fruit Conservation status …   Wikipedia


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